The hybrid helium blimp has telescoping landing legs and a completely retractable cabin, so it appears as a perfect sphere when in flight. While it has television and radio broadcasting capabilities, it can also reflect its own surroundings to blend in.

Air Genie

Not only can it be "invisible," but it can also be silent. The blimp has a "quiet operating, non-polluting power generation and propulsion system," according to the company.